This is a test most won't be able to conduct unless you have an adjustable bench top DC power supply or a 1.5V battery and some diodes to drop the current below 1.1V.
In this photo I have set the power supply to 1.1V DC and am measuring the current with the Fluke meter. As we can see, based on the Fluke meter, the diodes in the Galvanic Isolator are doing what they are intended to do, block DC current to 1.1V.. The Fluke reads 0.00A DC and this is how it should perform.
Current Flowing @ 1.3V
In this final image I turned up the DC voltage to 1.3V and we can now see the diodes beginning to allow current to flow. The Fluke is measuring 0.03A or three hundredths of an amp at 1.3V across the diodes.
This GI is doing what it should and will block dangerous DC galvanic current.
Hope this helps!!
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